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"I knew very little about what had happened to him so to come to RAF Waddington has helped to fill in some of the gaps.

"It’s a pleasure to be able to come here."

At the end of her visit Evelyn thanked personnel for “letting her get to know her brother once again”.

Sgt Leonard Evans completed his pilot training at the end of 1941 and was posted to No 44 Sqn in January 1942.

The mission was extremely risky; the factory was heavily defended (Image: MOD)

He completed his Lancaster conversion on 44 Sqn Training Flight and was posted to the ops flight in April 1942.

His first operational sortie was to be the Warnemunde raid where he acted as co-pilot on Lancaster R5557 KM-G to WO Jones, an experienced 44 Sqn pilot. It was from this mission that he failed to return.

Leonard never made it back (Image: MOD)

The raid on the town and the nearby aircraft factory was described by those who managed to return as some of the fiercest resistance they had come up against.

In her book about Dambuster pilot Johnny Hopgood, Jenny Elmes says he described it as 'quite the worst (for flak and searchlights) he has experienced and probably ever likely to in the future'.